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Learners will demonstrate the size (volume) differences between Earth, Earth’s Moon, and Mars. An extension is provided to estimate the distance between the Earth and the Moon, and the Earth and Mars, using the scale of the play dough planets' sizes. Advance preparation of the play dough (recipe provided) is required. This is lesson 3 of 16 in the MarsBots learning module. It was adapted from 3-D Model of the Earth and Moon, an activity in The Universe at Your Fingertips. Note: updated links to two resources required for this lesson are provided in the Related & Supplemental Resources (shown to the right) - Planet Comparison Website and the Survey of Mars slide show.